JPH0425533Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a material between an engine cover member and its tightening device, and specifically, a washer seal that tightens the cover member and seals bolt holes. Regarding.

[Conventional technology]

Conventionally, a washer seal for tightening and sealing a cover member consists of a metal reinforcing ring and a ring-shaped seal part made of an elastic material such as rubber, which are arranged at strategic points on the cover member and each is tightened. A sealing surface pressure was applied to the flange of the cover member and the gasket attached to the flange.

A detailed description will be given below with reference to the drawings.

Most of these cover members A have a plurality of tightening portions 3 for equalizing the tightening pressure as shown in FIG. 3, making the installation work complicated. A washer seal B', such as No. 12715, has been implemented in which a plurality of seal parts 1 are connected and integrated by a connecting fitting 2, thereby greatly simplifying the installation process.

[Problem that the invention attempts to solve]

However, such a washer seal
Since B' is mechanically tightened, it has a uniform tightening pressure, so the tightening cannot be adjusted.Therefore, the installation location and quantity of the tightening part 3 provided with the tightening device on the cover member A are extremely important. It has become a design element.

In addition, in the continuous structure of the seal portion 1 described above, as shown in FIG. 3, the washer seal B is attached to the cover member A, which has an intake/exhaust mechanism on each side surface, such as a cylinder head cover, and has different left and right side shapes. ′, the developed lengths of the left and right flanges are different, so naturally there will be a difference in the surface pressure they receive, and even if an equal tightening force is applied to each, there will be insufficient tightening pressure on one side and the other In this case, excessive tightening force is likely to be applied. Therefore,
One side of the gasket installed here suffers from poor sealing due to insufficient surface pressure, while the other side presents a serious drawback of material failure or material aging due to compression set caused by overcompression.

[Purpose of invention]

In view of these drawbacks, the present invention provides a washer seal that can automatically adjust the tightening pressure and apply uniform surface pressure to the entire surface of the flange while maintaining good formability and installation properties. It is an object.

[Means for solving problems]

The present invention relates to a washer seal B for tightening a cover member A, as shown in FIG. As shown in Figures 1 and 2, at least two ring-shaped seal parts 1 made of an elastic body such as synthetic rubber or synthetic resin are connected by connecting fittings 2, and the flange side with the short unfolded length dimension is connected. It is characterized in that a low compressibility seal portion 1a is provided on A2, and a high compressibility seal portion 1b is provided on the other flange side A1, which has a longer expanded length dimension.

[Effect]

The present invention has such a structure and exhibits the excellent effects shown below.

In other words, in the case of the cover member A, which has different side flange shapes on the left and right sides as shown in Fig. 3, it is natural that the unfolded length dimensions of the side flanges are different, and the amount of tightening surface pressure associated with this is also different between the left and right flanges. It's different. The washer seal B of the present invention is included in such a cover member A, and has both flange sides A1 and
A highly compressible seal part 1b is placed on the flange side A1, which has a long unfolded length dimension that requires strong contact pressure, by straddling each of the seal parts 1 connected to A2, and has a developed length that requires less contact pressure. A low-compressibility seal portion 1a is provided on the flange side A2, which has a short dimension, so that even if all the parts are mechanically tightened with the same torque using an automatic tightening device, the high-compressibility seal portion 1b will remain intact. The high compressibility is used to transmit a strong pressing force to the cover member A, and the other low compressibility seal part 1a is used to reduce the tightening force and transmit it, contrary to the above, and each is suitable from the developed size. A uniform tightening force was obtained, and as a result, the entire cover member A obtained a well-balanced and excellent sealing surface pressure.

〔Example〕

There are various methods to form the seal parts 1a and 1b having bottom compressibility or high compressibility according to the present invention. Moreover, the simplest method is to physically change the amount of compression by changing the shape of the seal portion 1. In this structure, the desired function can be provided by simply forming the seal portion 1a, which requires bottom compressibility, to have a small diameter, and the seal portion 1b, which requires high compressibility, to have a large diameter.

[Effect of idea]

As explained above, the present invention not only has superiority in formability and ease of installation by connecting the seal parts 1 with different compressibility, but also allows for uniform tightening of the cover member A. It has become an ideal washer seal that provides the optimal surface pressure for the gasket.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the washer seal of the present invention. FIG. 2 is a bottom view of FIG. 1. FIG. 3 is a plan view of a cover member whose left and right sides have different shapes. FIG. 4 is a bottom view of a conventional washer seal. A...Cover member, A1...Flange side with long unfolded length dimension, A2...Flange side with short unfolded length dimension, B...Washer seal, 1a...Bottom compressible seal portion, 1b...High Compressible seal portion, 2...
...Connection fitting, 3...Tightening part.

Claims (1)

[Claims for Utility Model Registration] (1) In the washer seal B for tightening the cover member A, in which the side flanges have different unfolded length dimensions;
At least two or more seal parts 1 made of an elastic body are connected and integrated by connecting fittings 2, and a low compressibility seal part 1a is provided on the flange side A2 having a short unfolded length dimension, and a low compressibility seal part 1a is provided on the flange side A2 having a short unfolded length dimension. A washer seal characterized in that a highly compressible seal portion 1b is provided on the flange side A1. (2) The washer according to claim 1 of the utility model registration claim, characterized in that, in the seal portion 1, the low compressibility seal portion 1a is formed to have a small diameter, and the high compressibility seal portion 1b is formed to have a large diameter. sticker.